Index: trunk/ippTasks/detrend.resid.pro
===================================================================
--- trunk/ippTasks/detrend.resid.pro	(revision 14630)
+++ trunk/ippTasks/detrend.resid.pro	(revision 14681)
@@ -130,5 +130,5 @@
     # look for new images in detPendingResidImfile
     book getpage detPendingResidImfile 0 -var pageName -key pantaskState INIT
-    if ($pageName == NULL) break
+    if ("$pageName" == "NULL") break
 
     book setword detPendingResidImfile $pageName pantaskState RUN
@@ -265,5 +265,5 @@
     # look for new images in detPendingResidExp
     book getpage detPendingResidExp 0 -var pageName -key pantaskState INIT
-    if ($pageName == NULL) break
+    if ("$pageName" == "NULL") break
 
     book setword detPendingResidExp $pageName pantaskState RUN